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Resting state MRI

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https://www.readbyqxmd.com/read/28634465/abnormal-resting-state-functional-connectivity-in-progressive-supranuclear-palsy-and-corticobasal-syndrome
#1
Komal Bharti, Matteo Bologna, Neeraj Upadhyay, Maria Cristina Piattella, Antonio Suppa, Nikolaos Petsas, Costanza Giannì, Francesca Tona, Alfredo Berardelli, Patrizia Pantano
BACKGROUND: Pathological and MRI-based evidence suggests that multiple brain structures are likely to be involved in functional disconnection between brain areas. Few studies have investigated resting-state functional connectivity (rsFC) in progressive supranuclear palsy (PSP) and corticobasal syndrome (CBS). In this study, we investigated within- and between-network rsFC abnormalities in these two conditions. METHODS: Twenty patients with PSP, 11 patients with CBS, and 16 healthy subjects (HS) underwent a resting-state fMRI study...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28631354/cross-population-myelination-covariance-of-human-cerebral-cortex
#2
Zhiwei Ma, Nanyin Zhang
Cross-population covariance of brain morphometric quantities provides a measure of interareal connectivity, as it is believed to be determined by the coordinated neurodevelopment of connected brain regions. Although useful, structural covariance analysis predominantly employed bulky morphological measures with mixed compartments, whereas studies of the structural covariance of any specific subdivisions such as myelin are rare. Characterizing myelination covariance is of interest, as it will reveal connectivity patterns determined by coordinated development of myeloarchitecture between brain regions...
June 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28630376/functional-connectivity-disturbances-of-the-ascending-reticular-activating-system-in-temporal-lobe-epilepsy
#3
Dario J Englot, Pierre-Francois D'Haese, Peter E Konrad, Monica L Jacobs, John C Gore, Bassel W Abou-Khalil, Victoria L Morgan
OBJECTIVE: Seizures in temporal lobe epilepsy (TLE) disturb brain networks and lead to connectivity disturbances. We previously hypothesised that recurrent seizures in TLE may lead to abnormal connections involving subcortical activating structures including the ascending reticular activating system (ARAS), contributing to neocortical dysfunction and neurocognitive impairments. However, no studies of ARAS connectivity have been previously reported in patients with epilepsy. METHODS: We used resting-state functional MRI recordings in 27 patients with TLE (67% right sided) and 27 matched controls to examine functional connectivity (partial correlation) between eight brainstem ARAS structures and 105 cortical/subcortical regions...
June 19, 2017: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/28629720/exploring-connectivity-with-large-scale-granger-causality-on-resting-state-functional-mri
#4
Adora M DSouza, Anas Z Abidin, Lutz Leistritz, Axel Wismüller
BACKGROUND: Large-scale Granger causality (lsGC) is a recently developed, resting-state functional MRI (fMRI) connectivity analysis approach that estimates multivariate voxel-resolution connectivity. Unlike most commonly used multivariate approaches, which establish coarse-resolution connectivity by aggregating voxel time-series avoiding an underdetermined problem, lsGC estimates voxel-resolution, fine-grained connectivity by incorporating an embedded dimension reduction. NEW METHOD: We investigate application of lsGC on realistic fMRI simulations, modeling smoothing of neuronal activity by the hemodynamic response function and repetition time (TR), and empirical resting-state fMRI data...
June 16, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28627049/making-group-inferences-using-sparse-representation-of-resting-state-functional-mri-data-with-application-to-sleep-deprivation
#5
Hui Shen, Huaze Xu, Lubing Wang, Yu Lei, Liu Yang, Peng Zhang, Jian Qin, Ling-Li Zeng, Zongtan Zhou, Zheng Yang, Dewen Hu
Past studies on drawing group inferences for functional magnetic resonance imaging (fMRI) data usually assume that a brain region is involved in only one functional brain network. However, recent evidence has demonstrated that some brain regions might simultaneously participate in multiple functional networks. Here, we presented a novel approach for making group inferences using sparse representation of resting-state fMRI data and its application to the identification of changes in functional networks in the brains of 37 healthy young adult participants after 36 h of sleep deprivation (SD) in contrast to the rested wakefulness (RW) stage...
June 19, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28623489/comparing-the-intracarotid-amobarbital-test-and-functional-mri-for-the-presurgical-evaluation-of-language-in-epilepsy
#6
REVIEW
Andreu Massot-Tarrús, Seyed Reza Mousavi, Seyed M Mirsattari
Surgery is the treatment of choice for drug-resistant temporal lobe epilepsy (TLE). However, such surgery frequently causes deficits in language function, especially if performed on the dominant hemisphere. In recent years, the intracarotid amobarbital test (IAT) has been gradually replaced by functional magnetic resonance imaging (fMRI) in the preoperative identification of language areas to estimate the risk of postoperative language decline. In this paper, we review the neural substrates for language processing, how language impairment can result both from TLE itself and from surgical attempts to treat it...
July 2017: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/28620297/racial-differences-in-insular-connectivity-and-thickness-and-related-cognitive-impairment-in-hypertension
#7
Ganesh B Chand, Junjie Wu, Deqiang Qiu, Ihab Hajjar
Hypertensive African-Americans have a greater risk of cognitive impairment than hypertensive Caucasian-Americans. The neural basis of this increased risk is yet unknown. Neuroimaging investigations suggest that the normal neural activity comprises complex interactions between brain networks. Recent studies consistently demonstrate that the insula, part of the salience network, provides modulation effects (information flow) over the default-mode and central-executive networks in cognitively normal subjects, and argue that the modulation effect is declined in cognitive impairment...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28620215/theta-band-transcranial-alternating-current-stimulations-modulates-network-behavior-of-dorsal-anterior-cingulate-cortex
#8
Keiichi Onoda, Toshikazu Kawagoe, Haixia Zheng, Shuhei Yamaguchi
Dorsal anterior cingulate cortex (dACC) is an important region in the processing of both cognition and affect. Recently, transcranial brain stimulation has been used to modulate cortical activity, but it is unclear whether this stimulation has a specific effect on dACC. Based on EEG evidence that frontal midline theta activity is generated in dACC, we hypothesized that transcranial alternating current stimulation (tACS) with theta band frequency would modulate neural networks including dACC. In this study, we examined the effects of theta band tACS on functional networks and emotional state...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28616383/multiparametric-mri-to-distinguish-early-onset-alzheimer-s-disease-and-behavioural-variant-of-frontotemporal-dementia
#9
Elisa Canu, Federica Agosta, Gorana Mandic-Stojmenovic, Tanja Stojković, Elka Stefanova, Alberto Inuggi, Francesca Imperiale, Massimiliano Copetti, Vladimir S Kostic, Massimo Filippi
This prospective study explored whether an approach combining structural [cortical thickness and white matter (WM) microstructure] and resting state functional MRI can aid differentiation between 62 early onset Alzheimer's disease (EOAD) and 27 behavioural variant of frontotemporal dementia (bvFTD) patients. Random forest and receiver operator characteristic curve analyses assessed the ability of MRI in classifying the two clinical syndromes. All patients showed a distributed pattern of brain alterations relative to controls...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28611728/are-movement-artifacts-in-magnetic-resonance-imaging-a-real-problem-a-narrative-review
#10
REVIEW
Inger Havsteen, Anders Ohlhues, Kristoffer H Madsen, Janus Damm Nybing, Hanne Christensen, Anders Christensen
Movement artifacts compromise image quality and may interfere with interpretation, especially in magnetic resonance imaging (MRI) applications with low signal-to-noise ratio such as functional MRI or diffusion tensor imaging, and when imaging small lesions. High image resolution has high sensitivity to motion artifacts and often prolongs scan time that again aggravates movement artifacts. During the scan fast imaging techniques and sequences, optimal receiver coils, careful patient positioning, and instruction may minimize movement artifacts...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28605972/resting-state-connectivity-between-default-mode-network-and-insula-encodes-acute-migraine-headache
#11
Gianluca Coppola, Antonio Di Renzo, Emanuele Tinelli, Cherubino Di Lorenzo, Marco Scapeccia, Vincenzo Parisi, Mariano Serrao, Maurizio Evangelista, Anna Ambrosini, Claudio Colonnese, Jean Schoenen, Francesco Pierelli
Background Previous functional MRI studies have revealed that ongoing clinical pain in different chronic pain syndromes is directly correlated to the connectivity strength of the resting default mode network (DMN) with the insula. Here, we investigated seed-based resting state DMN-insula connectivity during acute migraine headaches. Methods Thirteen migraine without aura patients (MI) underwent 3 T MRI scans during the initial six hours of a spontaneous migraine attack, and were compared to a group of 19 healthy volunteers (HV)...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28603791/automatic-hippocampal-subfield-segmentation-from-3t-multi-modality-images
#12
Zhengwang Wu, Yaozong Gao, Feng Shi, Valerie Jewells, Dinggang Shen
Hippocampal subfields play important and divergent roles in both memory formation and early diagnosis of many neurological diseases, but automatic subfield segmentation is less explored due to its small size and poor image contrast. In this paper, we propose an automatic learning-based hippocampal subfields segmentation framework using multi-modality 3TMR images, including T1 MRI and resting-state fMRI (rs-fMRI). To do this, we first acquire both 3T and 7T T1 MRIs for each training subject, and then the 7T T1 MRI are linearly registered onto the 3T T1 MRI...
October 2016: Machine Learning in Medical Imaging
https://www.readbyqxmd.com/read/28596724/recent-advances-in-translational-magnetic-resonance-imaging-in-animal-models-of-stress-and-depression
#13
REVIEW
Allison L McIntosh, Shane Gormley, Leonardo Tozzi, Thomas Frodl, Andrew Harkin
Magnetic resonance imaging (MRI) is a valuable translational tool that can be used to investigate alterations in brain structure and function in both patients and animal models of disease. Regional changes in brain structure, functional connectivity, and metabolite concentrations have been reported in depressed patients, giving insight into the networks and brain regions involved, however preclinical models are less well characterized. The development of more effective treatments depends upon animal models that best translate to the human condition and animal models may be exploited to assess the molecular and cellular alterations that accompany neuroimaging changes...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28596484/chemotherapy-induced-changes-of-cerebral-activity-in-resting-state-functional-magnetic-resonance-imaging-and-cerebral-white-matter-in-diffusion-tensor-imaging
#14
Caiqin Mo, Hailong Lin, Fangmeng Fu, Lin Lin, Jie Zhang, Meng Huang, Chuan Wang, Yunjing Xue, Qing Duan, Weiwen Lin, Xiangjin Chen
While chemotherapy related cognitive disorder has been described in many studies, but we still lack relatively reliable and objective diagnostic tools, and there are few similar studies in Asian patients. We recruited Asian breast cancer patients to perform a cohort study to uncover chemotherapy related cognitive disorder by using resting-state functioning magnetic resonance imaging (RS-fMRI) and magnetic resonance diffusion tensor imaging (DTI) combined with neuropsychologic assessments. This is the first prospective study which combines RS-fMRI and DTI to detect chemotherapy related cognitive disorder...
May 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28594850/no-changes-in-functional-connectivity-during-motor-recovery-beyond-5-weeks-after-stroke-a-longitudinal-resting-state-fmri-study
#15
Tanja C W Nijboer, Floor E Buma, Caroline Winters, Mariska J Vansteensel, Gert Kwakkel, Nick F Ramsey, Mathijs Raemaekers
Spontaneous motor recovery after stroke appears to be associated with structural and functional changes in the motor network. The aim of the current study was to explore time-dependent changes in resting-state (rs) functional connectivity in motor-impaired stroke patients, using rs-functional MRI at 5 weeks and 26 weeks post-stroke onset. For this aim, 13 stroke patients from the EXPLICIT-stroke Trial and age and gender-matched healthy control subjects were included. Patients' synergistic motor control of the paretic upper-limb was assessed with the upper extremity section of the Fugl-Meyer Assessment (FMA-UE) within 2 weeks, and at 5 and 26 weeks post-stroke onset...
2017: PloS One
https://www.readbyqxmd.com/read/28592457/functional-network-integrity-presages-cognitive-decline-in-preclinical-alzheimer-disease
#16
Rachel F Buckley, Aaron P Schultz, Trey Hedden, Kathryn V Papp, Bernard J Hanseeuw, Gad Marshall, Jorge Sepulcre, Emily E Smith, Dorene M Rentz, Keith A Johnson, Reisa A Sperling, Jasmeer P Chhatwal
OBJECTIVE: To examine the utility of resting-state functional connectivity MRI (rs-fcMRI) measurements of network integrity as a predictor of future cognitive decline in preclinical Alzheimer disease (AD). METHODS: A total of 237 clinically normal older adults (aged 63-90 years, Clinical Dementia Rating 0) underwent baseline β-amyloid (Aβ) imaging with Pittsburgh compound B PET and structural and rs-fcMRI. We identified 7 networks for analysis, including 4 cognitive networks (default, salience, dorsal attention, and frontoparietal control) and 3 noncognitive networks (primary visual, extrastriate visual, motor)...
June 7, 2017: Neurology
https://www.readbyqxmd.com/read/28583883/preferential-susceptibility-of-limbic-cortices-to-microstructural-damage-in-temporal-lobe-epilepsy-a-quantitative-t1-mapping-study
#17
REVIEW
Boris C Bernhardt, Fatemeh Fadaie, Reinder Vos De Wael, Seok-Jun Hong, Min Liu, Marie C Guiot, David A Rudko, Andrea Bernasconi, Neda Bernasconi
The majority of MRI studies in temporal lobe epilepsy (TLE) have utilized morphometry to map widespread cortical alterations. Morphological markers, such as cortical thickness or grey matter density, reflect combinations of biological events largely driven by overall cortical geometry rather than intracortical tissue properties. Because of its sensitivity to intracortical myelin, quantitative measurement of longitudinal relaxation time (qT1) provides and an in vivo proxy for cortical microstructure. Here, we mapped the regional distribution of qT1 in a consecutive cohort of 24 TLE patients and 20 healthy controls...
June 3, 2017: NeuroImage
https://www.readbyqxmd.com/read/28582529/disrupted-olfactory-integration-in-schizophrenia-functional-connectivity-study
#18
Sara Kiparizoska, Toshikazu Ikuta
Background: Evidence for olfactory dysfunction in schizophrenia has been firmly established. However, in the typical understanding of schizophrenia, olfaction is not recognized to contribute to or interact with the illness. Despite the solid presence of olfactory dysfunction in schizophrenia, its relation to the rest of the illness remains largely unclear. Here, we aimed to examine functional connectivity of the olfactory bulb, olfactory tract, and piriform cortices and isolate the network that would account for the altered olfaction in schizophrenia...
June 3, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28582450/spontaneous-low-frequency-bold-signal-variations-from-resting-state-fmri-are-decreased-in-alzheimer-disease
#19
Samaneh Kazemifar, Kathryn Y Manning, Nagalingam Rajakumar, Francisco A Gómez, Andrea Soddu, Michael J Borrie, Ravi S Menon, Robert Bartha
Previous studies have demonstrated altered brain activity in Alzheimer's disease using task based functional MRI (fMRI), network based resting-state fMRI, and glucose metabolism from 18F fluorodeoxyglucose-PET (FDG-PET). Our goal was to define a novel indicator of neuronal activity based on a first-order textural feature of the resting state functional MRI (RS-fMRI) signal. Furthermore, we examined the association between this neuronal activity metric and glucose metabolism from 18F FDG-PET. We studied 15 normal elderly controls (NEC) and 15 probable Alzheimer disease (AD) subjects from the AD Neuroimaging Initiative...
2017: PloS One
https://www.readbyqxmd.com/read/28578390/a-proof-of-concept-study-for-developing-integrated-two-photon-microscopic-and-magnetic-resonance-imaging-modality-at-ultrahigh-field-of-16-4-tesla
#20
Meng Cui, Yifeng Zhou, Bowen Wei, Xiao-Hong Zhu, Wei Zhu, Mark A Sanders, Kamil Ugurbil, Wei Chen
Functional magnetic resonance imaging (fMRI) based on the blood oxygen level dependent (BOLD) contrast has gained a prominent position in neuroscience for imaging neuronal activity and studying effective brain connectivity under working state and functional connectivity at resting state. However, the fundamental questions in regards to fMRI technology: how the BOLD signal inferences the underlying microscopic neuronal activity and physiological changes and what is the ultimate specificity of fMRI for functional mapping of microcircuits, remain unanswered...
June 2, 2017: Scientific Reports
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